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Compréhension des mécanismes de coupe lors du perçage à sec de l'empilage Ti6Al4V/Composite fibre de carbone

Abstract : Titanium alloys and CFRP structure parts are more en more used in aerospace and aircraft industries. They have an excellent combination of strength and fracture toughness as well as low density. Now in most case, theses work materials are stacked and have to be drill in one shot operation during the assembly operation. In dry cutting conditions, technologic and scientific problems are complex to solve. The first part of the study proposed a thermal balance analyze in the titanium part. The objective is to reduce the heat produce by the cutting edge and the margin so as to limit thermal damage of the composite part below. By experimental and numerical approaches, intensive work elastic recovery and thermal contraction of the inner wall has been underlined. These phenomena on the margin/work piece interface represent 50% of the global heat consumption. A complementary tribological investigation is done to estimated frictions coefficient and heat partition ratio at the interface to model and reduce the mechanical and thermal consequences induced on the inner wall. The last part of the study deal with carbon fiber cutting at different scales to improved the knowledge in this area. Drill geometry, coating and cutting parameters influences are analyzed to avoid the major defaults as exit délamination. Thanks to these works, bi-competence drill has been proposed with respect of work material surface integrity, environment and tool life criteria.
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https://pastel.archives-ouvertes.fr/pastel-00540551
Contributor : Cédric Bonnet <>
Submitted on : Saturday, November 27, 2010 - 12:39:42 PM
Last modification on : Friday, July 17, 2020 - 2:55:56 PM
Long-term archiving on: : Monday, February 28, 2011 - 2:34:45 AM

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  • HAL Id : pastel-00540551, version 1

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Cédric Bonnet. Compréhension des mécanismes de coupe lors du perçage à sec de l'empilage Ti6Al4V/Composite fibre de carbone. Génie mécanique [physics.class-ph]. Arts et Métiers ParisTech, 2010. Français. ⟨NNT : 2010ENAM0033⟩. ⟨pastel-00540551⟩

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